It reduces the threat of him being injured when he’s been a regular component of Mauricio Pochettino’s defence throughout the season.
However, Pochettino could see it one of two ways.
He could see Dier’s decision as a positive action from an ambitious young player trying to make his way in North London.
Not many youngsters would have the guts to say no to an under-21 international boss because they wanted to play in a different position for their club side.
It also helps Pochettino’s position at Spurs because the defence is an area of the team which has struggled so far this season.
It effectively takes the problem of where to play Dier out of Pochettino’s hands because he’s nailing his colours to the mast in terms of wanting to be a central defender for Tottenham.
Alternatively, Pochettino could be a little annoyed by Dier’s decision because of the benefits of playing at any level of international football.
Pochettino worked hard at Southampton to get younger players into international football and that desire for his players to succeed hasn’t dropped because of his move to Tottenham.
International football creates a different level of exposure and pressure which is important in the learning curves of younger players.
The situation is a little similar to when Jan Vertonghen made it clear that he didn’t want to play at left-back although that was a club dispute, which didn’t start on the international scene.
Ultimately, if Tottenham get a better centre back in the form of Dier out of his under-21 snub then Pochettino and Spurs fans can’t argue because it makes him a more effective player in his desired position.